Chlamydia trachomatis. False-colour transmission electron micrograph (TEM) of a cluster of the bacteria, Chlamydia trachomatis. These spherical, virus-like bacteria parasitise human cells in order to reproduce. Chlamydia trachomatis causes various types of genital, eye, and lymph node infections. It is responsible for the sexually- transmitted diseases: lymphogranuloma venereum (enlarged lymph glands with skin ulcers), and non- specific urethritis (NSU) affecting the urogenital tract. It also causes trachoma eye disease, a serious cause of blindness. Treatment is effective with antibiotic drugs such as erythromycin. Magnification: x60,000 at 6x4.5cm size.